Trimming and wrapping machine



March 16, 1954 w. E. GROSS ET AL 2,672,196

TRIMMING AND WRAPPING MACHINE Filed April 15, 1936 5 Sheets-Sheet l 3 r- AZ L 1 F/GZJ 1N VENTURE BY OW$%% ATTORNEY.

March 16, 1954 Filed April 13, 1936 w. E. GROSS ET AL 6 TRIMMING AND WRAPPING MACHINE 5 2 5 SheetS -Sheet 2 ATTORNEY.

March 16, 1954 W. E. GROSS ET AL TRIMMING AND WRAPPING MACHINE Filed April 15, 1936 5 Sheets-Sheet 3 .HVVENTORS WILL MM E. 69036 new/m a. #44 5 /4PV//Y6' a: 590W BY Wm? M, 4.

ATTORNEY.

March 16, 1954 w. E. GROSS ET AL 2,672,196

TRIMMING AND WRAPPING MACHINE Filed April 13, 1956 5 Sheets-Sheet 4 INVENTORS' BY W ATTORNEY.

March 16, 1954 w. E. GROSS ET AL TRIMMING AND WRAPPING MACHINE Filed April 13, 1936 5 Sheets-Sheet 5 ATTORNEY.

Patented Mar. 16, 1954 2,672,196 TRIMlVIING AND WRAPPING MACHINE a, Frank B. Hale, Bel Air, Baltimore, Md., assignors to the United States of America as represented by the Secretary of War Application April 13, 1936, Serial No. 74,048

William E. Gross, Jopp and Irving 0. Brown,

15 Claims.

(Granted under Title 3 sec. 266) The invention described herein may be manufactured and used ,by or for the Government for governmental purposes, without the payment to us of any royalty thereon.

This invention relates to a trimming and wrapping machine adapted especially for trimming and wrapping relatively easily torn material such as filter paper. A particular application of the invention is herein shown and described in connection with the trimming and wrapping of impregnated filter paper on a canister used to-filter air for breathing. This paper is manufactured especially for this purpose and must have a great multiplicity of fine poresfor efficient filtering and it therefore has relatively low tensile strength. The paper is preferably impregnated with activated charcoal, for example, to increase its filtering efiiciency and is then trimmed and wrapped on an elliptical canister. This canister is adapted. to contain air purifying chemicals within a perforated container, the filter paper being wrapped over the perforated wall of the canister. In order to obtain uniform filtering efficiency without excessive air resistance, it is necessary that the same number of layers of paper be placed on each canister.

One object of this invention is to provide a machine for drawing sheet material of low tensile 'strength therethrough and trimming the material and wrapping it on a form without tearing the material.

Another object of this invention is to provide a machine for trimming the edges of sheet material having low tensile strength without tearing when the material passes through the machine at variable speeds.

Another object of this invention is to provide a machine for trimming the edges of easily frangible filter paper and for wrapping a predetermined number of layers thereof around :an'air purifying canister, the machine being inexpensive to construct; not easily deranged, and

capable of operation by unskilled operators.

Another object'of this invention is to provide a trimming and wrapping machine in which the edge trimming knives always travel at the same speed as the material, so that a clean sharp cut is made even when easily frangible material is passed therethrough at variable speeds.

These and various other objects of the invention will be apparent from the following description and appended claims, it being understood that the invention is not limited to the details of construction herein set forth by way of illus- 'tration. a 1

5, U. S. Code (1952),

In the drawing, Fig. 1 is a side elevation of the machine; Fig. 2 is a front elevation thereof; Fig. 3 is an enlarged detail from the left side 5 of the machine, parts being broken away;

Fig. 4 is a section on line 4--4 of Fig. 3;

Fig. 5 is an enlarged central section taken on line 55 of Fig. 2;

Fig. 6 is an enlarged section on line 6-6 of Fig. 3 showing the driving and driver rollers and trimming knives;

Fig. '7 is a part section, part elevation of one tension roller and its mounting;

Fig. 8 is a perspective view showing the canister before receiving the wrapping; and

Fig. 9 is a similar view after wrapping of the canister.

Referring to the drawings, the machine comprises a rectangular frame I preferably of angle iron construction having two open ended brackets 2 at the rear upper end to receive trunnions 3 upon which is mounted the roll 4 of paper. The roll of paper may be adjusted transversely of the machine by knurled screw collars 5 and 6 so that the correct amount may be trimmed from each edge. It will be understood that the paper is impregnated prior to the winding into roll 4, and this impregnating leaves a narrow strip on each side of the paper which is not impregnated. These two side portions of unimpregnated paper are trimmed off and discarded in the passage of the paper through the machine.

From the roll 4 the paper passes over guide roller I adjacent the upper front of the machine, beneath guide roller 8 and thence over drive roller 9 and downward. Roller 9 is preferably covered with a serrated rubber covering to prevent slipping of the paper. The trimming of the edges of the paper is accomplished as the same passes over roller 9 and circular knives H (see Fig. 6) are mounted on each end of roller 9. Cooperating circular knives are mounted on the adjacent shaft seen in Fig. 6, as hereinafter more fully described.

Roller 9 is secured to shaft l2 by end collars l3 and set screws Ill, circular knives ll being secured to these collars. Shaft I2 is supported in frame I by anti-friction bearings and projects beyond the frame at the left side of the machine and has a squared end to'which is secured a ratchet It. A cooperating pawl 11 is mounted on collar it which is secured to a pinion l9, collar i8 and pinion I9 being freely swiveled on shaft 12. Shaft l2 and roller 9 thereon may thus be rotated in one direction by rotating pinion [9, the shaft being free to turn in the other 22 journaled in the frame, and having crank 23 secured on the right hand end thereof with a handle 24. Handle 24 is mounted on its crank forc- 25 inwardly so that when crank 23 is rothe handle normally its pin pins 25 and 26 will engage tated.

By the mechanism above described it will be 11 that roller 9 may be rotated by turning 29 with beveled edges 1n drivmg engagement with similarly beveled edges of pulleys 32 secured to shaft 62 by set screws or other securing means. Slidably mounted on sleeves 28 are two collars 32 of these knives will follow variations in paper speed. This is a feature of particular importance speed and speed of rotation of the knives will tear rather than out the paper.

In order to maintain tension of the paper against the roller 9, a pair of tension rollers 36 are sprng-pressed against the paper to hold it against roller 9. The two rollers 3') are mounted on and secured to a shaft 3'! (Fig. 7) which is loosely swiveled to a bracket 33. Bracket 38 has a cylindrical sleeve rollers may be pivoted on a shaft M secured to the frame. A pin 33 threaded at opposite ends passes freely through an elongated slot -12 in bracket 38, one end of said pin being threaded to a collar l l loosely mounted on the shaft 22, the opposite end havng two lock nuts to retain a coil spring 55. It will thus be seen that the two rollers 3b are resiliently pressed against roller 9 with the paper therebetween.

The two sides cut from the paper as it passes over roller 9 are received in channel shaped troughs st which carry these edges to a waste receptacle.

From the roller 9, the trimmed a cut-off device. In follow the roller 9, it bracket comprising paper drops past order that the paper may not passes in front of a swinging two side arms 4? which are freely pivoted on shaft 22 and are connected at their lower ends by a horizontal bar 48, thus forming a U-shaped bracket. As seen from Fig. 5, this bracket tends to swing outwardly with the lower bar in engagement with the paper. This outward movement is limited by the engagement The drive is so of nuts 49 on rod 5! secured to bar 48 with a slotted stop 52 secured to the stationary frame.

Just below the bracket above described is stationary cut-01f blade 53 and the horizontal movable blade 55. As seen in Fig. 2, the movable blade 54 is pivoted at 55 with its handle portion adjacent the right hand side of the machine. When cut-off knife is pressed inward to cut off a length of paper, the swinging bracket 47-48 pivots freely inward and then moves outward on the knife is relieved, to thus more the edge of the paper outward to an accessible position. A spring GE is secured to the frame pivot 55 whereby the cut-off knife 54 is pressed outwardly to clear the paper.

Below the cut-oif device is positioned a supporting means for the canister upon which the paper is wrapped. The canister 56, as seen in the heads 57. machine, as seen in Fig. 4, is secured to a shaft 59 which is rotatably and reciprocatively mounted in the frame. Spring 6| surrounds shaft 59 and head 58 into engagement with head 5'! of a canister.

Shaft 55 projects through the frame and has of lever 63 is connected by rod 65, bell-crank lever 66, and rod 6'! to a foot lever Fig. 1. By pressure on foot lever 68, the head 58 may be retracted to remove a wrapped canister and replace it with an empty one.

handle shaft outwardly.

As heretofore indicated, it is desirable that a predetermined number of layers of filter paper be wrapped around each canister. In order that this may be automatically accomplished without secured thereto which mesh-es mounted on the frame. Gear 17 has a stop pin '58 thereon so positioned that it will engage the inner end i5 of handle 14. The pinion I6 and gear I? are so proportioned that the stop pin 18 and handle 75 will engage after nine complete revolutions of a canister being wrapped. Obviously the relative sizes of pinion 16 and gear H or the position of stop pin 78 may be varied for different numbers of layers of paper as required.

Just below stationary cut-off blade 53 is positioned a plate 3| wh ch guides the hanging paper into a position whereby it may be readily grasped by the operator for the initial wrap around the canister.

Opcratzon.The course of the paper around the rollers is indicated by the heavy line in Fig. 5, and in Fig. 1. When a roll of impregnated paper 3 is positioned in the forked frame members 2, the knurled pulleys or collars are adjusted to center the roll, there being provided a feeler with a gear 77 gauge not shown, against which one edge of the roll is positioned. The paper is then fed over roller 1, under roller 8, and over roller 9, and upper handle 24 is rotated to feed the paper until stops 25 and 26 engage. When the lower edge of the paper is slightly below cut-off knife 54, this knife is pressed inward and released to obtain an even edge and also to measure the correct amount of paper required for the canister.

Foot pedal 68 is then depressed to reciprocate canister head 58 outward and an empty canister such as seen in Fig. 8 inserted between heads 58 and 69, and lower handle 14 is turned until stops 15 and 18 engage.

Upper handle 24 is then pulled outward to clear movable stop 25 of stationary stop 26 and crank 23 is given one complete turn or until these stops engage. This feeds the paper forward the equivalent of one complete wrap on the canister.

Crank 23 turns shaft 22 and gear 2| which drives gear l9, pawl l1 and ratchet 16, thus rotating shaft I2 and roller 9. Pulleys 3! drive pulleys 29 to rotate knife shaft 21 at a speed directly proportional to the paper speed. The parts are so proportioned that the peripheral speed of knives 33 is the same as or greater than the peripheral speed of drive roll 9 and knives l I mounted there- There is thus no tearing of the edges even with relatively easily frangible material, since a clean cut is made by the knives.

One revolution of upper handle 26 moves the paper forwardly so that its lower end may be grasped and wrapped around the canister to the point A on Fig. indicated by the termination of the heavy line representing the paper. The paper is held in this position with the left hand while the right hand grasps lower handle 14 which is reciprocated to clear stops 15 and 18. Crank I3 is then turned to directly rotate the canister and wind the paper thereon. The paper is thus pulled through the machine. Due to the elliptical shape of the canister, the paper advances at a constantly varying speed and the rotary knives 33 turn at a speed in direct proportion to the paper speed.

During this movement of the paper, the shaft 22 and handle 24 do not rotate, since the pawl 11 merely slips over its ratchet l6, and gears l9 and 2| do not turn. The edges of the paper fall into the troughs 46. When the requisite number of layers of the material have been wrapped, the stop I8 on gear 11 is in position to engage inner end of handle 15. In the present machine, this will be nine layers in addition to the one layer accomplished by rotation of handle 24. When these stops engage, the cut-off knife'54 is pressed in, swinging bracket 41-48 moving inward, and the operator grasps the end of the paper below the knife 54 and completes the wrapping. As indicated by the heavy dotted lines in Fi 5, this paper is 'sufticient to extend slightly beyond the point A where wrapping was started, thus giving ten complete layers and a short overlap.

In order to prevent unwinding of the paper, a spring-pressed clip 82, Fig. 9, is slipped over the paper on the canister, and the wrapped canister removed by pressure on foot treadle 68. The machine is then ready for another operation. During its complete travel through the machine, the paper is maintained under sufficient tension by the rollers to prevent any slipping.

Although this invention has been described in connection with the trimming and wrapping wof impregnated filter paper on a gas mask canister, it will be understood that the invention is not limited thereto. Furthermore, it will be understood that the invention is not confined to the precise details of construction herein set forth by way of illustration, as it is apparent that many changes and variations may be made therein by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the appended claims.

We claim:

1. A machine for trimming and wrapping sheet material on a form, comprising a roller over which the material passes, knives on the ends of said roller, cooperating rotary knives, means to draw the material over said roller to thereby rotate the same, and driving means between said roller and said cooperating knives whereby the rotary knives are driven at a speed directly proportional to the speed of the material; said driving means including resilient devices yieldably urging the rotary knives laterally into cooperative contact with the first mentioned knives.

2. A machine for trimming and wrapping sheet material, comprising a roller over which the material passes, knives on said roller, cooperating rotary knives, a form of non-circular cross-section upon which the material is wrapped, means for rotating said form to thereby draw the material over said roller at varying speeds and thereby rotate said roller, and driving means between said roller and rotary knives whereby said knives are rotated at a speed directly proportional to the speed of the material.

3. A machine for trimming and wrapping filter paper upon a canister, comprising a roller having knives thereon, cooperating rotary knives, a canister having a perforated wall about which the paper is wrapped, means for rotating said canister to thereby draw the paper over and rotate said roller, and means to rotate said rotary knives at a speed directly proportional to the speed of said paper.

4. A machine for trimming and wrapping filter paper upon a canister, comprising a roller having knives thereon, cooperating rotary knives, a canister of elliptical cross section having perforated wall about which the paper is wrapped, means for rotating said canister to thereby draw the paper over and rotate said roller, and a driving connection between said roller and said rotary knives whereby said knives will rotate at a speed direct- 1y proportional to the varying speed of the paper.

5. A machine for trimming and wrapping sheet material upon a form, comprising a roller having knives thereon, cooperating rotary knives, means to rotate said roller a predetermined amount to thereby advance the material, a rotatably mounted form upon which the material is to be wrapped, means to rotate said formand draw the material over and rotate said roller, and driving means between said roller and said rotary knives whereby said knives are rotated at a speed directly proportional to the speed of the material irrespective of which drive advances the material.

6. A machine for trimming and wrapping sheet material upon a form, comprising a plurality of rollers over which the material passes, rotatable trimming knives, a rotatable form upon which the material is wrapped, means for rotating one of said rollers to thereby advance the material, means to rotate said form to draw the material through the machine by wrapping on the form, and means to rotate said trimming knives at a speed proportional to the speed of the material.

7. A machine for trimming and wrapping sheet material upon a form, comprising a plurality of rollers over which the material passes, a rotatable form upon which the material is wrapped, a crank named crank after a predetermined number of layers of material have been wrapped on said form.

8. A machine for trimming and wrapping filter paper on an air purifying canister, comprising a plurality of rollers around which the paper vanced the equivalent of one layer on said ca nister, means to rotate said canister support whereby the paper may be drawn through the machine and wrapped on the canister, and mechanism to stop said last-named means after a predetermined number of layers have been wrapped on the canister.

9. The invention as defined in claim 8 characterized in that said rotary knives are always driven at a speed proportional to the movement of the paper.

10. In a machine for trimming and wrapping easily frangible material, a roller over which the material passes, a shaft to which said. roller secured, knives on said roller, a knife shaft, rotary knives secured to said knife shaft and in cooperative engagement with the knives on said roller, and driving mechanism between said roller shaft and said knife shaft whereby the rotary knives are driven at a speed proportional to the movement of the material.

11. In a machine for trimming filter paper and wrapping layers thereof around an air puri fying canister, means for supporting a roll of filter paper, rotary supporting means for a canister to be wrapped with the filter paper, means intermediate the roller and canister supports for trimming opposite edges of the paper as the latter be wrapped and provided with means for checking rotary movement of said support upon com- 8 pletionof each wrapping operation, and means for advancing the paper from the roll toward said support to engage the paper with the canister of the paper to an extent equivalent to one layer of the complete wrapping, and means in advance of the rotary support for severing the paper from the roll at the end of each wrapping operation.

14 In a machine for trimming and wrapping sheet material, means for trimming the edges otary support for an article about upon completion of the wrapping operation an: embodying a vertically swingable, substantially U-shaped bracket between the legs of which the paper is trained to feed, and a pivotally supported cut-off knife swingable in a substantially hori- WILLIAM GROSS. FRANK B. HALE. IRVING C. BROWN.

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